简答的lua调用c++函数例子

[huangxw3@ubuntu]$cat main.lua

-- call a C++ function

avg, sum = average(10, 20, 30, 40, 50)

print("The average is ", avg)

print("The sum is ", sum)

=============================

[huangxw3@ubuntu]$cat test.cpp

#include <iostream>

#include <stdio.h>



extern "C" {

#include "lua.h"

#include "lualib.h"

#include "lauxlib.h"

}

using namespace std ;



/* the Lua interpreter */

lua_State* L;

static int average(lua_State *L)

{

/* get number of arguments */

int n = lua_gettop(L);

double sum = 0;

int i;

/* loop through each argument */

for (i = 1; i <= n; i++)

{

/* total the arguments */

if (!lua_isnumber(L, i))

{

lua_pushstring(L, "Incorrect argument to 'average'");

lua_error(L);

}

sum += lua_tonumber(L, i);

}

/* push the average */

lua_pushnumber(L, sum / n);

/* push the sum */

lua_pushnumber(L, sum);

/* return the number of results */

return 2;

}

int main ( int argc, char *argv[] )

{

int error ;

/* initialize Lua */

L = lua_open();

/* load Lua base libraries */

luaopen_base(L); //
加载Lua基本库

luaL_openlibs(L);

/* register our function */

lua_register(L, "average", average);

/* run the script */

error = luaL_dofile(L,"main.lua");

/* cleanup Lua */

lua_close(L);

return 0;

}

[huangxw3@ubuntu]$ g++ test.cpp -Wall -g -fPIC -lm -ldl -llua -D USER_DEF -o test

[huangxw3@ubuntu]$./test

The average is 30

The sum is 150